21430248 has 48 divisors (see below), whose sum is σ = 62326080. Its totient is φ = 6122592.

The previous prime is 21430237. The next prime is 21430259. The reversal of 21430248 is 84203412.

It is an interprime number because it is at equal distance from previous prime (21430237) and next prime (21430259).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7936 + ... + 10287.

It is an arithmetic number, because the mean of its divisors is an integer number (1298460).

Almost surely, 2^21430248 is an apocalyptic number.

21430248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21430248 is an abundant number, since it is smaller than the sum of its proper divisors (40895832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21430248 is a wasteful number, since it uses less digits than its factorization.

21430248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18246 (or 18235 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 21430248 is about 4629.2815857323. The cubic root of 21430248 is about 277.7638558474.

The spelling of 21430248 in words is "twenty-one million, four hundred thirty thousand, two hundred forty-eight".